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    University of Wisconsin-Madison
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    Learners make kimchee or sauerkraut, which is really just fermented cabbage, in a 2-liter plastic bottle. The fermentation process takes from 3 days to 2 weeks to complete, and learners measure the...

    $1 - $5 per group Ages 4 - 14 1 to 4 weeks
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    NISE Network
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    This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing). Our sense of smell allows us to...

    $5 - $10 per group Ages 4 - adult 5 to 10 minutes
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    Oregon Museum of Science and Industry
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    Learners investigate how temperature affects the rate of chemical reactions by observing how steel wool reacts with various types of Kool-Aid solutions at different temperatures. The reaction is...

    $1 - $5 per group Ages 6 - 14 30 to 45 minutes
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    Perkins School for the Blind
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    This activity was designed for blind learners, but all types of learners can use it to investigate heterogeneous and homogeneous mixtures and solutions, identify the differences, and explore the...

    $1 - $5 per student Ages 11 - 18 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    In this investigation of reaction kinetics, learners alter the amount of iodate solution mixed with the same amount of starch solution. Visitors observe the solutions to see which concentration of...

    $1 - $5 per group Ages 14 - adult 5 to 10 minutes
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    Oregon Museum of Science and Industry
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    In this activity, learners mix several sugar solutions to investigate the property of density. Each sugar solution has a different density and color of the rainbow. The less dense sugar solutions...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes
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    PhET
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    In this online interactive simulation, learners will test the pH of liquids like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Learners will visualize the relative...

    free Ages 11 - adult 10 to 30 minutes
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    American Museum of Natural History
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    Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle....

    $1 - $5 per group Ages 8 - 18 10 to 30 minutes
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    New York Hall of Science
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    This is an activity about our sense of smell and how it compares to sharks' super noses. Learners will create varying solutions of water and perfume. Can you smell a single drop of perfume in...

    1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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    WGBH
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    In this activity, learners play a trick on their own brain to see if the brain can learn to ignore distracting input. Colors and words are used to play the visual trick, known as a Stroop Test....

    1 cent - $1 per group Ages 6 - 11 10 to 30 minutes